From d251c85dcea29b04cb577837be441d81c9e90876 Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Sun, 9 Oct 2011 13:00:39 -0400 Subject: [PATCH] alacdec: cosmetics: rename 'wasted_bits' to 'extra_bits'. The bits are not wasted, they are additional low bits that are added to the 16-bit decompressed samples to increase the output sample depth. --- libavcodec/alac.c | 40 ++++++++++++++++++++-------------------- 1 file changed, 20 insertions(+), 20 deletions(-) diff --git a/libavcodec/alac.c b/libavcodec/alac.c index 3772484..ce1244f 100644 --- a/libavcodec/alac.c +++ b/libavcodec/alac.c @@ -72,7 +72,7 @@ typedef struct { int32_t *outputsamples_buffer[MAX_CHANNELS]; - int32_t *wasted_bits_buffer[MAX_CHANNELS]; + int32_t *extra_bits_buffer[MAX_CHANNELS]; /* stuff from setinfo */ uint32_t setinfo_max_samples_per_frame; /* 0x1000 = 4096 */ /* max samples per frame? */ @@ -82,7 +82,7 @@ typedef struct { uint8_t setinfo_rice_kmodifier; /* 0x0e */ /* end setinfo stuff */ - int wasted_bits; + int extra_bits; /**< number of extra bits beyond 16-bit */ } ALACContext; static inline int decode_scalar(GetBitContext *gb, int k, int limit, int readsamplesize){ @@ -338,8 +338,8 @@ static void reconstruct_stereo_16(int32_t *buffer[MAX_CHANNELS], static void decorrelate_stereo_24(int32_t *buffer[MAX_CHANNELS], int32_t *buffer_out, - int32_t *wasted_bits_buffer[MAX_CHANNELS], - int wasted_bits, + int32_t *extra_bits_buffer[MAX_CHANNELS], + int extra_bits, int numchannels, int numsamples, uint8_t interlacing_shift, uint8_t interlacing_leftweight) @@ -357,9 +357,9 @@ static void decorrelate_stereo_24(int32_t *buffer[MAX_CHANNELS], a -= (b * interlacing_leftweight) >> interlacing_shift; b += a; - if (wasted_bits) { - b = (b << wasted_bits) | wasted_bits_buffer[0][i]; - a = (a << wasted_bits) | wasted_bits_buffer[1][i]; + if (extra_bits) { + b = (b << extra_bits) | extra_bits_buffer[0][i]; + a = (a << extra_bits) | extra_bits_buffer[1][i]; } buffer_out[i * numchannels] = b << 8; @@ -372,9 +372,9 @@ static void decorrelate_stereo_24(int32_t *buffer[MAX_CHANNELS], left = buffer[0][i]; right = buffer[1][i]; - if (wasted_bits) { - left = (left << wasted_bits) | wasted_bits_buffer[0][i]; - right = (right << wasted_bits) | wasted_bits_buffer[1][i]; + if (extra_bits) { + left = (left << extra_bits) | extra_bits_buffer[0][i]; + right = (right << extra_bits) | extra_bits_buffer[1][i]; } buffer_out[i * numchannels] = left << 8; @@ -421,7 +421,7 @@ static int alac_decode_frame(AVCodecContext *avctx, /* the output sample size is stored soon */ hassize = get_bits1(&alac->gb); - alac->wasted_bits = get_bits(&alac->gb, 2) << 3; + alac->extra_bits = get_bits(&alac->gb, 2) << 3; /* whether the frame is compressed */ isnotcompressed = get_bits1(&alac->gb); @@ -444,7 +444,7 @@ static int alac_decode_frame(AVCodecContext *avctx, } *outputsize = outputsamples * alac->bytespersample; - readsamplesize = alac->setinfo_sample_size - (alac->wasted_bits) + channels - 1; + readsamplesize = alac->setinfo_sample_size - alac->extra_bits + channels - 1; if (readsamplesize > MIN_CACHE_BITS) { av_log(avctx, AV_LOG_ERROR, "readsamplesize too big (%d)\n", readsamplesize); return -1; @@ -474,11 +474,11 @@ static int alac_decode_frame(AVCodecContext *avctx, predictor_coef_table[chan][i] = (int16_t)get_bits(&alac->gb, 16); } - if (alac->wasted_bits) { + if (alac->extra_bits) { int i, ch; for (i = 0; i < outputsamples; i++) { for (ch = 0; ch < channels; ch++) - alac->wasted_bits_buffer[ch][i] = get_bits(&alac->gb, alac->wasted_bits); + alac->extra_bits_buffer[ch][i] = get_bits(&alac->gb, alac->extra_bits); } } for (chan = 0; chan < channels; chan++) { @@ -532,7 +532,7 @@ static int alac_decode_frame(AVCodecContext *avctx, } } } - alac->wasted_bits = 0; + alac->extra_bits = 0; interlacing_shift = 0; interlacing_leftweight = 0; } @@ -559,8 +559,8 @@ static int alac_decode_frame(AVCodecContext *avctx, if (channels == 2) { decorrelate_stereo_24(alac->outputsamples_buffer, outbuffer, - alac->wasted_bits_buffer, - alac->wasted_bits, + alac->extra_bits_buffer, + alac->extra_bits, alac->numchannels, outputsamples, interlacing_shift, @@ -587,7 +587,7 @@ static av_cold int alac_decode_close(AVCodecContext *avctx) for (chan = 0; chan < alac->numchannels; chan++) { av_freep(&alac->predicterror_buffer[chan]); av_freep(&alac->outputsamples_buffer[chan]); - av_freep(&alac->wasted_bits_buffer[chan]); + av_freep(&alac->extra_bits_buffer[chan]); } return 0; @@ -603,11 +603,11 @@ static int allocate_buffers(ALACContext *alac) alac->outputsamples_buffer[chan] = av_malloc(alac->setinfo_max_samples_per_frame * 4); - alac->wasted_bits_buffer[chan] = av_malloc(alac->setinfo_max_samples_per_frame * 4); + alac->extra_bits_buffer[chan] = av_malloc(alac->setinfo_max_samples_per_frame * 4); if (!alac->predicterror_buffer[chan] || !alac->outputsamples_buffer[chan] || - !alac->wasted_bits_buffer[chan]) { + !alac->extra_bits_buffer[chan]) { alac_decode_close(alac->avctx); return AVERROR(ENOMEM); } -- 2.7.4